Andrewsa-(0-Alkenylary1)diazoalkanes. generated from tosylhydrazone salts, cyclise to 1 H-2.3-benzodiazepines in high yield. These products isomerise to the 5H-isomers under basic conditions. The energy barriers to ring inversion for both isomers have been estimated from n.m.r. spectroscopic data.

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Bromoallenes give allenic carbenes under basic conditions, which react with methylindoles to give alkenylquinolines by ring expansion and alkynyl-and allenyl-3H-indoles. Under the same conditions 2.5-dimethylpyrrole is converted into a 3-al kenyl-2,6-dimethylpyridine.

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